From another article: According to the suit, Apple began its own internal investigation of Devine in April, and uncovered the trove of e-mails he purportedly sent to alleged Singaporean accomplice Andrew Ang and several Asian companies containing confidential data and instructions on how to pay his kickbacks. This occurred when Apple officials discovered a Microsoft Entourage database of Devine's Hotmail and Gmail accounts "on the imaged copy of Devine's laptop hard drive."

src: http://www.sfweekly.com/thesnitch/2010/08/17/paul-shin-devin...

Also, most employers will tell you that they can (& will) monitor any activity done on your company issued devices (laptop, phones, anything). That seems pretty standard.